Agrellite
Appearance
Agrellite | |
---|---|
Allgemein | |
Kategorie | Inosilicates |
Formula (repeating unit) | NaCa2Si4O10F |
Strunz classification | 9.DH.75 |
Crystal system | Triclinic Pinacoidal class |
Identification | |
Color | White, grayish-white, greenish-white |
Crystal habit | Lath - shaped like a small, thin plaster lath, rectangular in shape |
Cleavage | perfect [110] |
Mohs scale hardness | 5.5 |
Luster | pearly |
Streak | white |
Diaphaneity | translucent |
Specific gravity | 2.88 |
Optical properties | biaxial |
Refractive index | nα = 1.567 nβ = 1.579 nγ = 1.581 |
Birefringence | δ = 0.014 |
References | [1][2] |
Agrellite (NaCa2Si4O10F) is a mineral found in Quebec, Canada. It is also known from few other areas.
Agrellite displays pink fluorescence under both shortwave and longwave ultraviolet light.[3]
It is named in honour of Stuart Olof Agrell (1913–1996).[4]
References
![](http://upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png)
Wikimedia Commons has media related to Agrellite.
- ^ http://www.mindat.org/min-57.html Mindat
- ^ http://www.webmineral.com/data/Agrellite.shtml Webmineral
- ^ Handbook of Mineralogy
- ^ first reported in the Canadian Mineralogist (1976), vol. 14, pp. 120-126